The more I think about it the more I think a core style or combo pack with TIE/X plus expansions of each could be the initial release.
This isn't Wave 8, it's going to be a separate special release between 7 and 8 and will be ready for purchase sometime this fall prior to the release of Episode 7. Wave 8 is looking like a spring release.
If all of that is fairly accurate they will be making the next announcement of Wave 9 in the spring when the Force Awakens is still in some theaters and most of us will have probably seen it multiple times. There will be plenty of new stuff they can roll out for a full wave or really close to it, not to mention aces style packs if something else needs some tweaking.
I'm still not entirely sold that it would be a full fledged core style set though. I think there are better odds of a most wanted style or aces style pack. My rationale? Luke Skywalker is a significant character in the new film and in X-Wing he is available only in the existing core set.